No, it was very rarely that the pic nic took place in august, it is Always at the beginning of september , the monegash people are in in holidays in august and there would not be enough people attending if it would be in august
Last year, it was august 31 th because the prince had to travel in China september 1st
This year, it is september 6th at the parc Princesse Antoinette , my friend received the invitation which said that it is on september 6th
I don't understand why you always need to start arguments. In 2015 the Picnic took place on August as well as last year. So it DOES take place in August sometimes.